Other Electronics

NeuroLog System

The Neurolog System from Digitimer is a rack system with a wide
variety of interconnecting modules for amplification, stimulation,
and signal processing.

Interconnection cables are minimised in the NeuroLog by a unique system of
automatically connecting module inputs and outputs via the case edge connectors. For many
linear arrangements of modules, this means that the only cabling is from the preparation
to the rack, and from the rack to your recording system.

A gated amplitude discriminator for nerve spikes and other events, with
separate outputs for within- above- and below-window spikes.

NL253/6 Ratemeter

Ratemeter's which calculate the 'instantaneous frequency' for a pulse train,
and produce an analog output proportional to the rate. Suitable for heart or
respiration rate (NL253), or neural firing rate (NL256).

NL601 Pulse Integrator

Produces an analog output proportional to the count of input pulses, with a full-scale
of 255, 2550 or 25500 pulses. Manually or automatically reset.

NL701 Lin Display

Produces an output signal which is proportional to the time interval between the last
two input pulses, allowing display of firing interval. A logarithmic version (NL700) is also
available.

NL702 Ratemeter

An averaging type ratemeter but with a fast response to changes of input frequency. Three
range settings of 100, 250 or 500 pulses per minute FS.

NL703 EMG Integrator

An 'leaky' integrator following a full-wave rectifier - ideal for monitoring of EMG activity
levels with 6 switchable time constants.

NL705 RMS Integrator

Computes input power by evaluating the root-mean-square signal level. Six switchable
time constants. Ideal for EMG estimation.

Please note that some NeuroLog modules may not be mentioned here, but may be found on
Digitimer's web site.

The Humbug is a really nifty little device which can seriously clean up your signal
without distorting it.

This is a powerful new technology for cancelling electrical interference in real-time, avoiding all
of the traditional problems associated with notch filters. The Hum Bug constructs a replica
of noise present on the input signal and continuously subtracts this replica from the signal
as it passes through the instrument. It performs this function in the presence of
biological activity even when noise characteristics evolve over time.

The HumBug is not a filter. It does not create phase delays, amplitude errors, DC shifts or
waveform distortion. Simply connect it between your preamplifier and any analysis equipment
and it will automatically eliminate 50/60 Hz noise and harmonics with frequencies up to
several kHz. Noise is eliminated without altering the signal of interest even when
frequencies within the signal overlap with noise components. No settings or adjustments are required.